In 1-quart casserole, combine all ingredients, except beans and tomato.
Mix well.
Microwave at High for 5 to 10 minutes, or until peppers are tender and flavors are blended, stirring once or twice.
Add beans and tomato.
Stir.
Microwave at High for 3 to 5 minutes longer, or until hot and bubbly, stirring once.